CVE-2026-77638CWE-362

CVE-2026-77638

High · published August 21, 2026

CVSS v3.1
8.9
EPSS
0%
Percentile
21.4
In the wild
Unconfirmed
What it is

Tor before 0.4.9.11 is prone to a race condition where in just the right circumstances a rendezvous point could man-in-the-middle (impersonate) the onion service that the client was trying to reach.

The record
Technical detail
CVSS v3.1
8.9 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00299 · 21.4th percentile
Weakness
CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Published
2026-08-21T01:17Z
Affected products (1)
ProductVersionsFixed in
torproject/tor< 0.4.9.110.4.9.11
References (1)
https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.11/ChangeLog · [email protected]
EPSS history
Timeline
  • 20 AUG 20:52Z
    Tor before 0.4.9.11 is prone to a race condition where in just the right circumstances a rendezvous point could man-in-the-middle (impersonate) the onion…
    cvelistv5